src/v8/test/intl/break-iterator/default-locale.js

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// Constructing BreakIterator with no locale arguments or with []
// creates one with default locale.

var iterator = new Intl.v8BreakIterator([]);

var options = iterator.resolvedOptions();

// Check it's none of these first.
assertFalse(options.locale === 'und');
assertFalse(options.locale === '');
assertFalse(options.locale === undefined);

// Then check for equality.
assertEquals(options.locale, %GetDefaultICULocale());

var iteratorNone = new Intl.v8BreakIterator();
assertEquals(options.locale, iteratorNone.resolvedOptions().locale);

// TODO(cira): remove support for {} to mean empty list.
var iteratorBraket = new Intl.v8BreakIterator({});
assertEquals(options.locale, iteratorBraket.resolvedOptions().locale);